refactor: consolidate duplicate functions (calculateDesignTime, calculateDesignCapacityCost, generateSwarmEnemies)

src/lib/game/utils/enemy-utils.ts

@@ -1,10 +1,24 @@
-// ─── Enemy Naming System ───────────────────────────────────────────────
+// ─── Enemy Naming & Swarm Generation ──────────────────────────────────
 // Moved from store-modules/enemy-utils.ts to eliminate legacy dependencies
 
 import type { EnemyState } from '../types';
 import { SWARM_CONFIG } from '../constants';
 import { getFloorMaxHP, getFloorElement } from './floor-utils';
 
+// Barrier elements more likely to have barrier
+const BARRIER_ELEMENTS = ['light', 'water', 'earth'];
+
+// Get barrier for an enemy (0-1 as percentage of max HP)
+function getEnemyBarrier(floor: number, element: string): number {
+  if (floor < 20) return 0;
+  const baseChance = BARRIER_ELEMENTS.includes(element) ? 0.15 : 0.08;
+  const floorBonus = Math.min(0.25, (floor - 20) * 0.003);
+  const barrierChance = Math.min(0.4, baseChance + floorBonus);
+  if (Math.random() > barrierChance) return 0;
+  const floorProgress = Math.min(1, (floor - 20) / 80);
+  return 0.1 + floorProgress * 0.2;
+}
+
 // Enemy names by element and floor tier
 const ENEMY_NAMES_BY_ELEMENT: Record<string, string[]> = {
   fire: ['Fire Imp', 'Flame Sprite', 'Emberling', 'Scorchling', 'Inferno Whelp'],
@@ -49,8 +63,7 @@ export function generateSwarmEnemies(floor: number): EnemyState[] {
       maxHP: Math.floor(baseHP * SWARM_CONFIG.hpMultiplier),
       armor: SWARM_CONFIG.armorBase + Math.floor(floor / 10) * SWARM_CONFIG.armorPerFloor,
       dodgeChance: 0,
-      healthRegen: 0, // Will be set by caller if needed
-      barrier: 0, // Will be set by caller if needed
+      barrier: getEnemyBarrier(floor, element),
       element,
     });
   }